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<html>
 <head>
  <title> new document </title>
  <meta charset="utf-8">
 </head>
 <body>
	<h1>事件绑定</h1>
	<button id="btn1">发射子弹</button>
  <button id="btn2">获得奖励</button>
	<button id="btn3">失去奖励</button>
	<script src="js/jquery-1.11.3.js"></script>
	<script>
		
	</script>
 </body>
</html>
